There is a built in function to change the pov, named (believe it or not) "ChangePOV". Just invoke it with:
ChangePOV(newPOVobject)
and that object will now be the POV. Just be sure that, in any custom scripts you may write, that you use "game.pov" instead of "player" if you wish to access things on the current pov.
And the POV defaults to "player" at startup unless you specify otherwise in your game config.